Minnesota and Wisconsin issued air quality advisories as a result of the smoke from the Greenwood Fire in Lake County and fires in Ontario's Quetico Provincial Park.
Minnesota's advisory began Tuesday and was extended until 8 p.m. Friday. The advisory includes St. Louis, Carlton, Lake, Cook, Itasca and Koochiching counties. The Minnesota Pollution Control Agency reported that air quality would be the worst around Duluth on Thursday morning, before improving in the afternoon, when the wind is expected to move the smoke toward Itasca and Koochiching counties.
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Rain isn't expected in Northeastern Minnesota until Friday afternoon.
A section spanning Duluth, Ely and International Falls was placed under the Air Quality Index categories of "unhealthy for all," while the rest of the region was placed under the category of "unhealthy for sensitive groups."
The Wisconsin Department of Natural Resources announced Thursday morning that an advisory was in place until midnight Friday in the northern half of the state. The advisory included 40 of the state's counties, including Douglas, Bayfield and Ashland counties.
The Air Quality Index is expected to reach the level of unhealthy for all groups, according to the Wisconsin DNR. Anyone with respiratory and cardiac problems, elderly people and children as well as people engaged in strenuous outdoor activities should avoid extended time outdoors.